Automatic chuck.



T. RE HULING} 5; H. L. CRAIG.

AUTOMATIC! CHUCK.

APPLICATION TIL ED JAN. 13, 1909.

Patented M22128, 1910.

Z SHEETS-811E111 1.

INVENTORS 3 w 4/ oz: Allamcy I. R. HULING & H. L. 0mm.

AUTOMATIC CHUCK.

APPLIU'AIION FILED JAN. 13, 1909.

Patented. Mar. 8, 1910.

2 SHEBTS-SEEHT L INVENTORS 1312M A Home;

v n sTATEs PATENT ornrc TOBRENOE RANDOLPH HULING- AND HARBIE LEONARDCRAIG, OF JERSEY SHORE,

PENNSYLVANIA.

AUTOMATIC CHUCK.

Specification of Letters Patent.

Patented Mar. 8. ii.

To all whom it may concern:

Be it known that we, TORRENOE R. HULING and Hannm L. CRAIG, of JerseyShore, in the county of Lycoming and State of Pennsylvania, haveinvented certain new and useful Improvements in Automatic Chucks; and wedo hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

Our invention relates to an improvement in automatic chucks.

The object of the improvement is to provide a chuck of such constructionthat it may be adjusted so as to subject the tool connected therewith toany desired maximum strain or tension and to instantly disconnect thetool from the actuating mechanism of the chuck when such maximum strainor pressure shall have been exceeded.

A. further object is to provide a chuck embodying the mode of operationabove set forth which will insure the prompt retraction of the toolwhenthe chuck is rotated in the opposite direction.

With these objects in view our invention consists in certain features ofconstruction and combinations of parts as will be hereinafter describedand pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in side elevation ofour improvements. Fig. 2 is a View in end elevation of the chuck withits casing removed and showing the mechanism of the chuck in positionwhen the parts are subjected to the ordinary stress or strain for whichthe parts are ad justed to operate. Fig. 3 is a similar view spindle.Fig. 5 is a detached view of one showing the position of the parts whenthe tool connected with the chuck is subjected to an abnormalresistance. Fig. 1 is a detached view in side elevation of the chuck ofthe chuck blocks, showing the pawl connected therewith, and Fig. 6 is aview in side elevation illustrating our automatic chuck as applied to amotor and tube expander.

1 represents the chuck casing or head provided with a hub 2 having asquare or angular socket 3 formed thereinfor the reception of the toolto be operated by the chuck.

Within the head 1 are located on opposite sides of its center twosliding blocks 1, each of which is provided at one end with a cam face 5which engages a cam face 6 on a sliding block 7, the latter beingarranged to reciprocate at right angles to the block 4:. The block 7 isforced outwardly by means of a spiral spring 8 which is seated at oneend on a follower 9 which is retained in any desired adjustment by meansof a screw threaded shank 10 which may be operated by a screw driverfrom the outside of the chuck head.

sides with shoulders 19, each of which engages a corresponding squareshoulder 20 formed on the sliding blocks 4, while the flattened faces 21adjacent to such radial shoulders fit against the inner parallel faces22 on said sliding blocks. The hub or collar 12 is provided with twosemi-circular grooves 23, each of which terminates at one end in asquare shoulder 24:. Each one of the sliding blocks 1 has pivoted in oneof its ends a small pawl 25 which is forced out-- wardly by a spring 26.The operative parts of the chuck are protected and retained in place bymeans of the removable casing 27 which is secured to the head of thechuck by the screws 28. The removable head is provided with a screwthreaded hub 29 upon which is secured an adjustable collar 30, suitablepacking being interposed between the collar and the hub.

Having described the construction and relative' arrangement of theseveral parts of our improvement we will now briefly describe itsoperation.

Assuming that the chuck is attached to a flue expander, as representedin Fig. 6, in which 31 is an electric motor which rotates the hollowdriving shaft 32 through which rotary motion is imparted to the spindle11 of our improved chuck. Within the annular socket 3 in the head of thechuck is received the angular end of the conical screw subjected to widechanges of temperature and it rolled too hard they will soon begin toleak and cannot be tightened again owing to the hardness of their ends.Hence in using our automatic chuck in connection with a tube expanderthe tension of the spiral springs is first adjusted to such a degree aswill insure the rolling of: the ends of the tubes sutlicient to insureof their being firmly secured to the heads of the boiler,

'but on the other hand the adjustment is suchas will release anddisengage the chuck from the expander tool when the pressure or strainexceeds that for which the springs are adjusted. In the operation of thedevice rotary motion is imparted to the chuck spindle which in turnrotates the casing of the chuck and the expander tool, but just as soonas the tube expander meets with resistance in excess of that to whichthe spiral springs of the chuck has'been adjusted the shoulders 19 onthe collar of the chuck spindle will reciprocate the sliding blocks atin opposite directions and force the cam faced blocks rearwardly asufficient distance to permit the toothed collar or hub on the spindleto completely rotate without rotating the spindle of the tube expanderand thus shield the latter from excessive or abnormal strain andpressure. By reversing the motor the chuck is promptly put into open;tion again to rotate the tube expander in the opposite direction so asto retract it by means of the following devices. lVhen'the reciprocatingblocks have been moved in opposite directions, as has been explained, tothrow the tube expander out of operation it permits the pawls 25connected with each one of said blocks to be moved or thrown outwardlyby their springs so as to project into the semicircular grooves 23 inthe collar or head of the chuck spindle and when the latter is rotatedin the opposite direction its shoulders will engage the ends of thepawls and force the sliding blocks backwardly again into their normalposition, and by continuing to rotate the chuck spindle backwardly inthe same direction the tube expander is rotated backwardly therewith andretracted.

WVhile we have described our chuck as being adapted for use inconnection with a tube expander we would have it understood that We dollOllllllllll ourselves to. such parblocks arranged at right angles tosaid ticular use because it may be employed for a wide variety of usesof a similar nature, and again it may be combined and operated by anelectric motor, or a pneumatic motor or in a ratchet or drill press.

Having fully described our invention what we claim as new and desire tosecure by Lette1.s-Patent, is V 1. 1n an automatic chuck, thecombination of sliding blocks adapted to move in opposite directions,and spring actuated cam faced 'ding blocks, of a chuck spindle providedwith shoulders constructed to interlock with corresponding shoulders onsaid sliding blocks.

2. In an automatic chuck, the combination with the chuck head or casingand chuck spindle journaled in one face of the head, said spindle beingprovided with shoulders, of sliding blocks having shoulders adapted tointerlock with the shoulders on the chuck spindle, and adjustable springactuated blocks for resisting the movement of said sliding blocks.

3. In an automatic chuck, the combination of a chuck head or casing,sliding blocks having inclined ends, adjustable spring actuated blocksprovided with inclined ends adapted to engage the inclined ends of thesliding blocks, and a chuck spindle provided with shoulders adapted tointerlock with corresponding shoulders on the sliding blocks.

4. In an automatic chuck, the combination with a chuck head or casing,sliding blocks mounted therein and adapted to move in oppositedirections, spring actuated blocks arranged at rightangles to saidsliding blocks and engaging their ends, of a chuck spindle journaled inone face of the chuck casing and provided with shoulders adapted tointerlock with corresponding shoulders on said sliding blocks.

5. in an automatic chuck, the combination with a chuck head or casing,sliding blocks mounted therein, spring actuated blocks for restrainingthe movement of said sliding blocks and spring actuated pawls mounted inthe sliding blocks, of a chuck spindle provided with shoulders adaptedto engage said pawls and thereby move said sliding blocks back to theirnormal position.

(3. In an automatic chuck, the combination with a chuck head or casing,and a chuck spindle journaled to rotate in the head or casing, ofsliding blocks arranged parallel to one another and on opposite sides ofthe spindle, said blocks and spindle being pro vided. with interlockingshoulders, of adjust able spring actuated blocks for restraining themovement of said sliding blocks.

T. In an automatic chuck, the combination with the head or casing of thechuck, and a spindle mounted in one face of the head so as to rotatetherein and provided with a shouldered member, of reciprocating blocks,

one on each side of the spindle and parallel specification in thepresence of two subscrib- With each other, said blocks having shoulingWitnesses. ders to interlock with the shouldered memloer on the spindle,spring actuated blocks constructed to engage the ends of said slidingblocks, and means for adjusting the ten- Witnesses: sion of the sprinactuated blocks. BRUCE C. WILLIAMSON,

In testimony w ereof, we have signed this THOMAS E. HAYS.

TORRENCE RANDOLPH HULING. HARRIE LEONARD CRAIG.

